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Energy Dispersive Spectroscopy Characterization of Solute Segregation in Ti-6Al-4V

Peterson, Brian

Abstract Details

2011, Master of Science, Ohio State University, Materials Science and Engineering.
Ti-6Al-4V, or Ti-6-4, remains the most widely used titanium alloy in the US market. There remains little or no work investigating the Energy Dispersive Spectroscopy (EDS) characterization of solute segregation in Ti-6-4 as a function of sample geometry. Specifically, there are limited investigations of reduced sample thickness and its effects on measured sample composition. Using a vertically oriented drop furnace, samples of α/β processed, mill anneal Ti-6-4 were held at temperatures of 954°, 899°C, 843°C, and 788°C followed by a water quench. The resulting microstructures contained primary equiaxed alpha (α) and martensitic, prior-β regions. EDS characterization of heat treated samples was conducted for bulk samples in the SEM, electropolished thin foil samples in the TEM, and samples thinned to 250-350nm in the focused ion beam (FIB) that were investigated at 12.5, 15, and 20 keV. Vanadium was the solute of interest for this analysis since it exhibits pronounced segregation between the primary α and prior-β regions, as illustrated by the pseudo-binary β isomorphous phase diagram for Ti-6-4. Generally, bulk SEM and thin foil TEM EDS analyses for vanadium concentration were in good agreement with one another. However, a trend of decreasing aluminum concentration with increasing accelerating voltage was observed in the thinned SEM samples. Conversely, measured vanadium concentration increased with higher accelerating voltages. For the 954°C heat treatment, vanadium concentrations ranged from 0.3 to 0.9 wt.% for the α phase and from 2.7 to 3.1 wt.% in the prior-β regions. The 899°C heat treatment resulted in vanadium concentration ranges from 0.7 to 1.0 wt.% in the α and 4.3 to 4.5 wt.% in the prior-β region. The measured vanadium concentration for the 843°C heat treatment was between 0.7 to 1.3 wt.% for the α phase and from 4.9 to 5.3 wt.% in the prior-β. The 788°C heat treatment resulted in vanadium concentrations of 1.5 to 1.9 wt.% in the α and 8.6 to 9.6 wt.% in the prior-β region.
Hamish Fraser, PhD (Advisor)
James Williams, PhD (Committee Member)

Recommended Citations

Citations

  • Peterson, B. (2011). Energy Dispersive Spectroscopy Characterization of Solute Segregation in Ti-6Al-4V [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1293718338

    APA Style (7th edition)

  • Peterson, Brian. Energy Dispersive Spectroscopy Characterization of Solute Segregation in Ti-6Al-4V. 2011. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1293718338.

    MLA Style (8th edition)

  • Peterson, Brian. "Energy Dispersive Spectroscopy Characterization of Solute Segregation in Ti-6Al-4V." Master's thesis, Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1293718338

    Chicago Manual of Style (17th edition)